Client Background & Needs
This Battery Energy Storage System (BESS) is a vital component of the UK’s renewable energy infrastructure. Located in the West Midlands, this advanced energy storage facility has the capacity to supply 114,000 homes with power for two hours when fully charged. The site plays a critical role in stabilising the grid, especially during periods of peak demand or grid instability.
Given the high-power capacity of the BESS, ensuring a robust and compliant earthing system was paramount. The client required a comprehensive assessment to confirm that the earthing infrastructure could manage fault currents effectively, protect site personnel, and maintain safe voltage levels across the system.
Pendulum Power Earthing was selected for this project due to our expertise in complex power system analysis, extensive experience in earthing system auditing, and proven track record in ensuring compliance with UK safety standards for high-voltage installations.
Challenges & Approach
The BESS connects directly to the National Grid’s 275kV substation, presenting unique technical and logistical challenges. Ensuring the earthing system’s performance under fault conditions required precise measurements and expert analysis.
Key challenges included:
- Interference Risk: The close proximity of the BESS to the 275kV National Grid substation increased the risk of mutual interference, potentially compromising system stability.
- Measurement Complexity: Achieving accurate results from Fall of Potential (FOP) testing in such a high-voltage environment required specialised equipment and expertise.
- Compliance Pressure: Strict adherence to UK electrical safety standards, including BS EN 50522 and ENA TS 41-24, was mandatory.
To overcome these challenges, our team devised a tailored testing strategy that evaluated the earthing system both in isolation and in parallel with the National Grid infrastructure. This ensured accurate insights into its performance under real-world conditions.
Implementation & Solution
Our team conducted extensive Fall of Potential (FOP) Testing to assess the earthing system’s effectiveness. This involved:
- Using high-precision testing equipment to measure voltage gradients and touch/step potentials across the site.
- Testing the earthing system in isolation to understand its standalone performance.
- Conducting additional tests with the BESS connected in parallel to the National Grid’s 275kV substation, simulating real-world conditions.
Our experts followed best practices in earthing audit assessment, ensuring the system provided low impedance pathways to ground and effective fault current dissipation. Special attention was given to ensuring voltage rise limits were well within safe parameters.
Results & Impact
The detailed Fall of Potential testing revealed critical insights that confirmed the earthing system met all relevant safety standards, including BS EN 50522 and ENA TS 41-24.
Key outcomes included:
- Enhanced Safety: The testing ensured effective dissipation of fault currents, reducing step and touch voltage risks.
- Grid Stability Assurance: By verifying earthing effectiveness when interconnected with the National Grid, our assessment confirmed the system’s resilience during grid disturbances.
- Compliance Confirmation: The client gained peace of mind knowing their system met regulatory requirements, minimising the risk of future penalties or operational issues.
Our assessment played a vital role in ensuring the operational integrity of the BESS, reinforcing its ability to deliver power to 114,000 homes during peak demand periods.
Conclusion & Key Takeaways
The earthing assessment showcased Pendulum Power Earthing’s ability to manage complex high-voltage infrastructure challenges. Our precise testing methodology and expert insights ensured the client’s system remained both compliant and operationally secure.
This project highlights our commitment to delivering reliable, efficient, and safety-focused solutions for the UK’s evolving energy sector. Clients seeking trusted expertise in BESS earthing, fault current management, and grid compliance can confidently turn to Pendulum Power Earthing for comprehensive solutions.
